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It depends if you want extra bulk or extra HP. Lots of people pick Blissey because Leftovers is so important, and it is. IMo, Chansey is better, but if you want extra HP, go with Blissey._____
Wish. And Protect. Fore Chansey. Softboilled for Blissey. That's the stall. Softbliled IS helpful, it restores half your HP with no wait. I like Wish + Protect though. Protect is THE stall move. But be careful, you don't heal HP automatically, so someone could do a lot of damage or set up or something. ____

softboiled can heal over 300 hp on chansey, a great move. Seismic toss always does 100 damage, which is useful due to chanseys lack of attack. Counter is to deal with physical moves against pokemon which might take you down in two hits (conkeldur with hammer arm). Toxic is for the extra damage, also deals with ghost types while you can stall with softboiled.

blissey is better than chansey in my opinion. It can run leftovers which is pretty important. Also, other than SpD and Hp, Chanseys stats suck and can get OHKOed by anything that uses physical attacks. It's lack of offensive capability makes it incredibly easy to set up on. Blissey, on the other hand, has workable SpA, which makes it a somewhat more threatening enemy than Chansey. Blissey also has a better movepool. I don't particularly like either of them though.